Most International Governments have useful websites which outline their environment policies and programs.
The links below are an excellent place to start when searching for information on relevant authorities - you'll be surprised just how much information is published by Governments around the world.
The Australian Government Department of the Environment and Water Resources (formerly the Department of the Environment and Heritage) develops and implements national policy, programs and legislation to protect and conserve Australia's natural environment and cultural heritage.
The mission of the Environmental Protection Agency is to protect human health and the environment. Since 1970, EPA has been working for a cleaner, healthier environment for the American people
The Ministry for the Environment is the New Zealand Government’s principal adviser on matters that affect the environment. It provides leadership across central and local government.